Improvement in devices for rounding the ends of bolts



`1 N EL S0 N D e v i c e fu r R o u n d i n g l th e e n d s o f B o l ts 910,163,797, A Patented May 25,1875.

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TH E GRAPHIC C0.PH OTO L|TH.39 3; 4 PARK PLACK, N.Y.

UNITED STATES PATENT QEEIcE JAMES NELSON, OF SUNDERLAND, ENGLAND.

IMPROVEMENT IN DEVICES FOR ROUNDING THE ENDS OF BOLTS.

Specification forming part of Letters Patent No. 163,797, dated May 25, 1875 application filed December l2, 1874.

To all whom it may concern:

Be it known that I, J AMES NELsoN, of Sunderland, England, engineer, have invented or discovered a new and Improved Device for Trimming Studs and Bolts 5 and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters and figures marked thereon. The machine which forms the subject of this lnventlon is intended for cutting and finishing the en ds of studs and bolts, more particularly when 1n their places, but it may also be used to cut and finish their ends before they are put 1nto place.

One important feature of my invention consists in a spindle7 bearing a cutter on its lower end, and a crank or equivalent rotating device on its upper end, the said spindle revolving in a cylindrical guide-body axially with the stud to be cut.

Another important feature is the device for producing an automatic intermittent feed of the cutter up to the work.

Another feature of importance consists in providing the guide-body with a threaded opening at the bottom, by which the said body is rmly secured to the bolt or stud to be cut, and in the proper position for the cutter to operate thereon.

Figure 1 of the accompanying drawings is a sectional view of a machine constructed according to my invention. Fig. 2 is a view of the under side of the handle. Fig. 3 is a plan of the self-acting feed-gear which I prefer to employ; Fig. 4 a side elevation, Fig. 5 a plan, and Fig. 6 a horizontal section, of the body; Fig. 7 an elevation, Fig. 8 a vertical section, and Fig. 9 a horizontal section, of the spindle and cutter.

The same letters of reference indicate the same parts in all the figures.

A is the stud or bolt the end of which it is desired to cut and iinish. B represents the part of the engine or machine from which the stud A projects. C represents a washer or ring placed temporarily over the stud, the depth of such washer or ring being regulated according to the extent to which it is desired to cut the bolt. D is the body of my machine, the lower part of which has an internal screw or nut, E, by which it is fastened to the stud A. Above the nut E the body D is cylindrically hollow, and is formed with holes F, to allow lubricants to be injected and the cuttings to be removed. G is a spindle, contained within the cylindrical portion of the body D, and having fixed in its lower end (or it may be made in a piece with it) a cutter or knife. H. The cutting-edge of this cutter is shaped according to the configuration required to be given to the stud end, and the cutter is fixed in the spindle so that the cutting-edge is exactly in the center of the spindle, as seen in Figs. 8 and 9. I is a handle on the top of the spindle G, by which the spindle and cutter are rotated.

It will be readily understood that, by rotating the handle and giving a slow feed to the cutter, the end of the stud will be cut as required. Any ordinary and suitable self-acting feed-gear may be employed for this purpose; that shown in the drawings, and which I now proceed to describe, will be found to answer well.

In the upper end ot' the body D, which is screw-threaded for the purpose, [screw a sort of gland, K, upon the top of which the handle I rests; or a bush, K', may be interposed to receive the friction. The upper part of the gland is formed on its periphery with teeth L,

the points of which are slightly within a flange, M, on the body D. At one portion of this fiange M is an inclined recess, N. Atthe under side of the handle I is a box, O. In this box are a slide, P, and a spring, Q, which spring has a tendency to force the said slide outward, so as to cause a pawl or catch, R, on the slide to enter the teeth L. The iiange M of the body, however, keeps the pawl back out of the teeth; but once in every revolution of the handle I the pawl comes opposite the recess N ofthe flange, and, being then no longer kept back, is allowed to ent-er between two of the teeth L, and to move the gland Kthe distance of one tooth before the incline of the said recess, by acting against the pawl, again compels it t0 recede. Supposingy there are twenty-two of the teeth L, twentytwo revolutions of the handle will impart one revolution to the gland K. The gland K is thus screwed gradually farther into the body D, and the handle I, with the spindle Gr and cutter H, is, therefore, gradually advanced.

It will be understood that, at the commencement of the operation, the flange of the gland K must not be in contact with the iiange M of the body D, and that when it reaches the iiange M, as seen in Fig. l, the feed cannot proceed farther.

To allow of a few linishin g turns being given to the cutter after the feed has stopped, I mount a lever or arm, S, eccentrically on a back prolongation ofthe slide I), in such inan=A ner that, by lifting this lever from the position shown in dotted lines, Fig. l, to that shown in full lines, the pawl R of the slide is drawn clear of the teeth L.

By means of my machine, stud or bolt ends maybe finished in their places to the required length and shape much better and in very much less time than they can be chipped and iiled by hand, and thus much skilled labor, in the manufacture of engines and other machinery and constructions, is saved.

What I claim, and desire to secure by Letters Patent, is-

l.. In a device for trimming studs and bolts, a rotary spindle, G, provided with a cutter, H, aflixedremovably to its lower extremity, and a rotating crank or handle, I, at the top, in combination with astationary cylindrical guidebody, D, and` anintermittent and'arrestable feeding mechanism forfeeding the said cutter up to a stationary stud or bolt, substantially in the manner shown, and for the purposes specified.

2. In a device for trimming studs and bolts, the combination of the rotating spindle G, provided with a cutter, H, and handle I; the stationary guide-body D, withA a threaded opening, E, and an intermittentfsfeeding mechanism, consisting of the threaded gland K, bearinga toothed flange, L; the stationary lia-nge M, with beveled recess N; the spring detent or p'awl R 0n the piston P, actuated by a spring, Q,.and cam-lever S, all arranged to operate in the manner and for the purposes substantially as set forth.

3. In a device for trimming studs and bolts, in combination with the rotating cutter H on the spindle G, the stationary cylindrical guidebody D, provided with a threaded opening, E, in the bottom of the same, by means of which the said stationary body may be securely attached to the stud or bolt to be operated upon, in the manner substantially as shown, and for the purposes specified.

In witness whereof I, the said JAMES NEL- soN, have hereunto set my hand this twentyfirst day of September, one thousand eight hundred and seventy-four.

JAMES NELSON.

Witnesses:

ROBERT SMITH GANDLIsE, GEORGE NIKON PATTERSON. 

